Junior Software Developer

SigmaSoftware2

Kyiv, Kyiv city, Ukraine Remote permanent

Posted: February 23, 2026

Required Skills

Job Description

We are looking for a Junior Software Developer to join one of our teams and help us build great products for our clients.

Join our Stellar team and become a part of a group of over 300 experts in the AdTech domain. What is Stellar? It’s a community, a network, and a dedicated business unit within Sigma Software that specializes in advertising technology solutions. Over the years, we’ve had opportunities to work with some of the largest AdTech companies in the world. We brought tons of AdTech startups from an idea to a thriving business. Since 2008, we’ve worked with advertising technology companies to help them envision, build, and support their technology.

We are building a Competence Center where we stay focused on exploring our domain to become the best specialists in the industry. If you strive to build long-term cooperation, develop business and partnerships with the best Customers, and are ready to commit to joint business development, this could be a perfect match.

• Maintain and enhance existing data processes, ensuring reliability, performance, and scalability
• Improve and support Python-based services; contribute to the development of new ones
• Design, implement, and optimize scalable data architectures
• Drive system reliability and performance improvements across all data workflows
• Modernize data processes by introducing new tools and technologies
• Work with and improve the data orchestration layer (Airflow) for stable operation and scalability
• Collaborate with cross-functional teams to ensure architectural alignment and best practices adoption

• Proficiency in Python for data processing and platform development
• Strong knowledge of SQL with ability to write efficient, complex queries
• Hands-on experience with Snowflake
• Experience with DBT for data transformation and modeling
• Practical experience with Airflow for orchestration of data workflows
• Strong communication, collaboration, and problem-solving skills
• Ability to operate independently, take ownership, and drive initiatives to completion
• Bachelor’s degree in Computer Science, Engineering, or related field

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